Unipolar dynamo-electric machine.



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No. 885,888. J EATENTED AUC. 11, 1908. J. E. NCECCEEATE.

UNIPCLAE DYNAMC ELECTRIC MACHINE.

AVPP-LIOATION .FILED APR. l, 1907.

2 SH'EBTS-SHBET 2.

.r r J a l/I/TAEEEEE C.. W8' *1X8 l JAI-0B E. NOEGGERATH, oF scHENEcTADY, NEWYORK, AssIG'NoR To GENERAL ELECTRIC COMPANY, ACORPORATION OF NEW YORK.

UNIPOLAR DYNAMIC-ELECTRIC MACHINE,

Specification of Letters Patent.

Patented Aug. 11, 190s.

Application 1ed April 1 1907. Serial `N o. 365,679.

To all whom it may. concern:

Be it known that I, JAKoB E. NoEGGE- BATH, a citizen of the UnitedStates, residing at Schenectady, county of Schenectady,

-State of New York, have invented certain new and useful ImprovementsinUnipolar Dynamo-Electric Machines, -of' which the following is aspecication.

My invention relates to unipolar dynamo-y electric machines, andparticularly to small machines of this type; and-*its object is toprovide certain improvements'in the construction and arrangement of suchmachines.

Except in low-voltage machines'the armatures of unipolar generators areprovided with a plurality of conductors and collector rings throughwhich .the armature conduc.

tors are connected in series by means of statlonary cross connectingconductors and .brushes bearing onthe collector rings. In

order to render thecrosskconnecting conductors readily accessible, Irovide a platel detachably secured to the eld structure,

and mount the cross-connecting conductors on this member so) thatthey-'are bodily removable as a unit with the plate.

.My invention further consists in'mounting the brushesA directly onthese conductorsso that the brushes also are removable with the platefor inspectionand renewal.

My invention will best'be understood by reference to the accompanyingdrawings, in which v Figure 1 shows a side elevation, with the casingpartly broken away, of a dynamo-electric machine arranged in accordancewith my invention; Fig. 2 shows an. end elevation yof the same, partlyvvin crosssection; and Fig. 3 shows a perspective viewoi" the removableplate, cross-connecting conduc tors and brushes.

In the `drawings, A represents the field magnet, and B thearmature',`the outlines of vwhich-are shown in dotted lines in Fig. 1.

C C represent the'eld coils whichsurround the armature andproduce amagnetization which may be considered as entering the armature from thecenter of. the field magnet, which extends uniformly aroundthe armatureso as to produce a uni olar ield, and as passing outwardin bothlrections throughthe armature andback-into the field-magnet at the endsofthe armature.

The armature, as usual, is, provided with a plurality -of armatureconductors," (not shown), which are connected at their ends'to collectorrings formed of flat insulated strips secured to a plate F by clampsThis plate F is detachably supported on the'fleld-magnet by screws, asshown in Fig. 2. of these lates are provided,one on each side of t eiield magnet. Brushes G are mounted directly on the ends of theconductors E,'and are consequently removable with the plate F forinspection and renewal. Current leads H are connected to the centralpoints of some or all .of the conductors E, so that a plurality ofcurrents of different voltages may be derived from the machine.

The brushes G are formed of superposed flexible metallic strips, sincethis type -of brushis most satisfactory for collecting cur-y rent athigh speed. Idle lubricating brushes I formed of graphite or othersuitable lubrie eating material also bear on the collector rings, andwhile performing no electrical function, serve to lubricate the ringsand de vcrease the wear on the current collecting rings and brushes.Cover plates J may be provided which protectgthe ends of the con-Preferably, two

ductors E and -the brushes, but which are readily removed to permit insection.v

' yWhat I claim as new and esire'to secure b'y Letters Patent of' theUnited States, is,

1. In a4 dynamo-electric machine, a unipolar iield structure, anarmature providedv with a plurality of collector rm s, a detachablemember-secured to the ie dl structure, and conductors for cross;connecting the collector rings carried' by and movable with saidmember. v

2. In a dynamo-electric machine, annipolar ield structure, an"armatuieprovided with a vplurality of collector rin s, a detachablemembersecured to the 'e d structure,

conductors carried by and removable Witln said said member, and brushes'.ca rried by said removable conductors and bearing on rings.

3. In a dynamo-electric machine, a uni polar field structure, anarmature-provided Witha plurality of-collector rings, a detach. ablemember secured to the fle d structure, conductorsfor cross-connectin thecollector ringscarried .by and remova le with said member.

4. In a dynamo-electric machine, a unipolar lield structure, an armatureprovided with a plurality of collector rings, a detachable )late securedto the field structure, a plurality of ilat conductors clamped to saidplate and extending parallel to the armature conductors, and brushescarried by said flat conductors bearing on said collector rings.

5. In a dynamo-electric machine, a unipolar ield structure, an armatureprovided with aplurality of collector rin s, a detachable member securedto the fie d' structure, conductors for cross-connecting the collectorrings carried by andimovablewithfsaidlmember, and current-leadsconnected to the centers of the cross-connecting conductors. :il

6. In a dynamo-electric machine, allumipolar field structure, anarmature provided with a plurality of collector-rines, a detachablemember secured'to the ieId structure, conductors carried by andremovable with said member, 4brushes carried by said removableconductors and bearing on said rings, and current-leads connected to thecenters ol' said removable conductors.

In witness whereof I have hereunto set my hand this 29th day of March,1907.

JAKOB. E. N OEGGICltA'lI-l. Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

